Display device

ABSTRACT

A display device includes: a first display panel; a first flexible substrate on which a first driver IC outputting a driving signal to the first display panel is mounted; a second flexible substrate being apart from the first flexible substrate, at least a part of the second flexible substrate overlapping the first flexible substrate; and an insulating material disposed between the first flexible substrate and the second flexible substrate. The first flexible substrate is connected to the first display panel so that the first driver IC is on a side of the second flexible substrate. The insulating material is disposed between the first driver IC and the second flexible substrate.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority from Japanese application JP2017-061376, filed Mar. 27, 2017. This Japanese application isincorporated herein by reference.

TECHNICAL FIELD

The present invention relates to a display device.

BACKGROUND

A display device includes liquid crystal display device. A flexibleprint circuit board on which driver ICs are mounted is connected to thedisplay device. The driver ICs output drive signals in order to displayan image.

A technology, in which two display panels overlap each other isconventionally proposed to improve contrast of a liquid crystal displaydevice (for example, see WO 2007/040158). For example, WO 2007/040158discloses that a color image is displayed on a first display panel, anda monochrome image is displayed on a second display panel, therebyimproving contrast.

SUMMARY

In the display device in which two display panels overlap each other,two flexible print circuit boards which are respectively connected tothe two display panels, could overlap each other. In this case, a driverIC mounted on one flexible print circuit board contacts with a surfaceof the other flexible print circuit board, or contacts a driver ICmounted on the other flexible print circuit board. Thereby, the otherflexible print circuit board could be disconnected or both driver ICscould be damaged.

The present disclosure provides a display device that can prevent aflexible print circuit board from being disconnected by a driver ICmounted on the other flexible print circuit board, or prevent driver ICsrespectively mounted on two flexible print circuit boards from damaged,even if two flexible print circuit boards overlap each other.

To solve the above problem, a display device according to a presentdisclosure comprises: a first display panel; a first flexible substrateon which a first driver IC outputting a driving signal to the firstdisplay panel is mounted; a second flexible substrate being apart fromthe first flexible substrate, at least a part of the second flexiblesubstrate overlapping the first flexible substrate; and a compressibleinsulating material disposed between the first flexible substrate andthe second flexible substrate. The first flexible substrate is connectedto the first display panel so that the first driver IC is on a side ofthe second flexible substrate, and the insulating material is disposedbetween the first driver IC and the second flexible substrate.

The display device according to the present disclosure can prevent aflexible print circuit board from being disconnected by a driver ICmounted on the other flexible print circuit board, or prevent bothdriver ICs respectively mounted on two flexible print circuit boardsfrom damaged, even if two flexible print circuit boards overlap eachother.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a view illustrating a schematic configuration of a displaydevice according to the present exemplary embodiment;

FIG. 2 is a view illustrating a schematic configuration of a firstdisplay panel of the display device according to the present exemplaryembodiment;

FIG. 3 is a view illustrating a schematic configuration of a seconddisplay panel of the display device according to the present exemplaryembodiment;

FIG. 4 is an exploded perspective view of the liquid crystal displaydevice according to the present exemplary embodiment;

FIG. 5 is a partially sectional view taken along line V-V in FIG. 4;

FIG. 6 is a partially sectional view taken along line VI-VI in FIG. 4;

FIG. 7 is a partially sectional view of the liquid crystal displaydevice according to a first modification;

FIG. 8 is a partially sectional view of the liquid crystal displaydevice according to a second modification;

FIG. 9 is a partially sectional view of the liquid crystal displaydevice according to a third modification; and

FIG. 10 is a partially sectional view of the liquid crystal displaydevice according to a variation of the third modification.

DETAILED DESCRIPTION

The following describes an exemplary embodiment of the presentdisclosure. The embodiment described below is merely one specificexample of the present disclosure. The numerical values, shapes,materials, elements, and arrangement and connection of the elements,etc. indicated in the following embodiment are given merely by way ofillustration and are not intended to limit the present disclosure.Therefore, among elements in the following embodiment, those not recitedin any one of the independent claims defining the broadest inventiveconcept of the present disclosure are described as optional elements.

Note that the figures are schematic illustrations and are notnecessarily precise depictions. Accordingly, the figures are notnecessarily to scale. Moreover, in the figures, elements that areessentially the same share like reference signs. Accordingly, duplicatedescription is omitted or simplified.

Note that in this specification and drawings, X-axis, Y-axis and Z-axisrepresents three-dimensional coordinates and are orthogonal to eachother.

Embodiment

Initially, an overall configuration of a display device 1 according toan exemplary embodiment of the present disclosure is described, withreference to FIGS. 1-3. FIG. 1 is a view illustrating a schematicconfiguration of the display device 1 according to the present exemplaryembodiment. FIG. 2 is a view illustrating a schematic configuration of afirst display panel 100 of the liquid crystal display 1. FIG. 3 is aview illustrating a schematic configuration of a second display panel200 of the display device 1.

The display device 1 is one example of an image display device fordisplaying still images or moving images (videos). As illustrated inFIG. 1, the display device 1 includes a first display panel 100 disposedcloser to an observer (front side), and second display panel 200disposed closer to a backlight (rear side) than first display panel 100is. Although the first display panel 100 and the second display panel200 may have same shapes of contours in planer view, it is alsoacceptable that the first display panel 100 and the second display panel200 may have different shapes of contours.

The first display panel 100 is a main panel and displays an image whichis viewed by a user. In the present exemplary embodiment, the firstdisplay panel 100 displays a color image.

A first source FPC (flexible print circuit) 110 and a first gate FPC 120relevant to first flexible substrates are connected to the first displaypanel 100. The first source FPC 110 and the first gate FPC 120 areconnected to terminals of the first display panel 100 through forexample anisotropic conductive films.

The first source FPC 110 is a flexible print circuit on which a firstsource driver 111 is mounted. The flexible print circuit is a flexiblefilm substrate which has a conductive pattern (metal lines) made ofmetal such as a thin copper film is formed on a substrate made of aninsulating resin material such as a polyimide material. The first sourcedriver 111 is an IC chip including a plurality of ICs, and is mounted onthe first source FPC 110 by means of COF (Chip On Flex) technology.

In this exemplary embodiment, twelve first source FPCs 110 are providedalong a long edge of the first display panel 100. Each of twelve firstsource FPCs 110 is provided with a corresponding one first source driver111. The number of the first source FPC 110 is not limited to twelve.

A first circuit board 112 is connected to an end of the first source FPC110 opposing to an end closer to the first display panel 100. The firstcircuit board 112 is electrically connected to the first display panel100 through the first source FPC 110. The first circuit board 112 is aprinted circuit board having a rectangular shape. A plurality ofelectric parts are mounted on the first circuit board 112. The firstcircuit board 112 sends various signals output from a first timingcontroller 410, to the first source driver 111 of the first source FPC110. In this exemplary embodiment, one first circuit board 112 isconnected to six first source FPCs 110. That is to say, there are twofirst circuit boards 112. The number of the first circuit board 112 isnot limited to two.

The first gate FPC 120 is a flexible print circuit on which a first gatedriver 121 is mounted. The first gate driver 121 is an IC chip includinga plurality of ICs, and is mounted on the first gate FPC 120 by means ofCOF (Chip On Flex) technology.

In this exemplary embodiment, seven first gate FPCs 120 are respectivelyprovided along a pair of short edges of the first display panel 100.Each of total fourteen first gate FPC 120 is provided with acorresponding one first gate driver 121. The number of the first gateFPC 120 is not limited to fourteen.

Thus, the first source driver 111 and the first gate driver 121 relevantto first driver ICs outputting drive signals to the first display panel100 are mounted on the first source FPC 110 and the first gate FPC 120respectively.

When a color image is displayed on a first image display area 130 of thefirst display panel 100, various signals, which are output from a firsttiming controller 410, are input to the first source driver 111 and thefirst gate driver 121. Incidentally, various signals are input to thefirst source driver 111 through the first circuit board 112.

The second display panel 200 is a sub panel disposed in a rear side ofthe first display panel 100. The second display panel 200 displays amonochrome image (black and White image) corresponding to the colorimage displayed on the first display panel 100, in synchronization withthe color image.

A second source FPC 210 and a second gate FPC 220 relevant to secondflexible substrates are connected to the second display panel 200. Thesecond source FPC 210 and the second gate FPC 220 are connected toterminals of the second display panel 200 through for exampleanisotropic conductive films.

The second source FPC 210 is a flexible print circuit on which a secondsource driver 211 is mounted. The second source driver 211 is an IC chipincluding a plurality of ICs, and is mounted on the second source FPC210 by means of COF (Chip On Flex) technology.

In this exemplary embodiment, twelve second source FPCs 210 are providedalong a long edge of the second display panel 200. Each of twelve secondsource FPCs 210 is provided with a corresponding one second sourcedriver 211. The number of the second source FPC 210 is not limited totwelve.

A second circuit board 212 is connected to an end of the second sourceFPC 210 opposing to an end closer to the second display panel 200. Thesecond circuit board 212 is electrically connected to the second displaypanel 200 through the second source FPC 210. The second circuit board212 is a printed circuit board having a rectangular shape. A pluralityof electric parts are mounted on the second circuit board 212. Thesecond circuit board 212 sends various signals output from a secondtiming controller 420, to the second source driver 211 of the secondsource FPC 210. In this exemplary embodiment, one second circuit board212 is connected to six second source FPC 210. That is to say, there aretwo second circuit boards 212. The number of the second circuit board212 is not limited to two.

The second gate FPC 220 is a flexible print circuit on which a secondgate driver 221 is mounted. The second gate driver 221 is an IC chipincluding a plurality of ICs, and is mounted on the second gate FPC 220by means of COF (Chip On Flex) technology.

In this exemplary embodiment, seven second gate FPC 220 are respectivelyprovided along a pair of short edges of the second display panel 200.Each of total fourteen second gate FPC 220 is provided with acorresponding one second source driver 211. The number of the secondgate FPC 220 is not limited to fourteen.

Thus, the second source driver 211 and the second gate driver 221relevant to second driver IC outputting drive signals to the seconddisplay panel 200 are mounted on the second source FPC 210 and thesecond gate FPC 220 respectively.

When a monochrome image is displayed on a second image display area 230of the second display panel 200, various signals, which are output froma second timing controller 420, are input to the second source driver211 and the second gate driver 221. Incidentally, various signals areinput to the the second source driver 211 through the second circuitboard 212.

As illustrated in FIGS. 2-3, the first image display area 130 and thesecond image display area 230 are composed of a plurality of pixelsarranged in a matrix. The number of pixels included in the first imagedisplay area 130 and the number of pixels included in the second imagedisplay area 230 may be the same or may not be the same. For example,the first image display area 130 of the first display panel 100, whichis a main panel, includes a greater number of pixels than the secondimage display area 230 of the second display panel 200, which is a subpanel.

In this exemplary embodiment, the display device 1 is a liquid crystaldisplay device, and the first display panel 100 and the second displaypanel 200 are liquid crystal display panels. Drive schemes for the firstdisplay panel 100 and the second display panel 200 are, but not limitedto, for example lateral electrical field types such as in-planeswitching (IPS) or fringe field switching (FFS). The drive schemes maybe vertical alignment (VA) or twisted nematic (TN), for example.

The display device 1 further includes a backlight 300. The backlight 300is disposed on a rear side of the second display panel 200.

The backlight 300 emits light to the first display panel 100 and thesecond display panel 200. For example, the backlight 300 is an LEDbacklight which includes a light emitting diode (LED) as a light source.However, the backlight 300 is not limited thereto.

The display device 1 includes the first timing controller 410 thatcontrols the first source driver 111 and the first gate driver 121 ofthe first display panel 100, the second timing controller 420 thatcontrols the second source driver 211 and the second gate driver 221 ofthe second display panel 200, and an image processor 500 that outputsimage data to the first timing controller 410 and the second timingcontroller 420.

As illustrated in FIG. 2, based on first image data DAT1 and a firstcontrol signal CS1 (such as a clock signal, a vertical synchronizingsignal, or a horizontal synchronizing signal), which are output from theimage processor 500, the first timing controller 410 generates a firstimage data signal DA1 and various timing signals (data start pulse DSP1,data clock DCK1, gate start pulse GSP1, and gate clock GCK1) to controlthe first source driver 111 and the first gate driver 121. The firsttiming controller 410 outputs first image data DA1, a data start pulseDSP1, and a data clock DCK1 to the first source driver 111, and outputsa gate start pulse GSP1 and a gate clock GCK1 to the first gate driver121.

The first source driver 111 outputs a data signal (data voltage)corresponding to the first image data DA1 to source lines SL1 of thefirst display panel 100 based on the data start pulse DSP1 and the dataclock DCK1. The first gate driver 121 outputs a gate signal (gatevoltage) to gate lines GL1 of the first display panel 100 based on thegate start pulse GSP1 and the gate clock GCK1.

As illustrated in FIG. 3, based on second image data DAT2 and a secondcontrol signal CS2 (such as a clock signal, a vertical synchronizingsignal, or a horizontal synchronizing signal), which are output from theimage processor 500, the second timing controller 420 generates a secondimage data signal DA1 and various timing signals (data start pulse DSP2,data clock DCK2, gate start pulse GSP2, and gate clock GCK2) to controlthe second source driver 211 and the second gate driver 221. The secondtiming controller 420 outputs second image data DA2, a data start pulseDSP2, and a data clock DCK2 to the second source driver 211, and outputsa gate start pulse GSP2 and a gate clock GCK2 to the second gate driver221.

The second source driver 211 outputs a data signal (data voltage)corresponding to the second image data DA2 to source lines SL2 of thesecond display panel 200 based on the data start pulse DSP2 and the dataclock DCK2. The second gate driver 221 outputs a gate signal (gatevoltage) to gate lines GL2 of the second display panel 200 based on thegate start pulse GSP2 and the gate clock GCK2.

As illustrated in FIG. 1, the image processor 500 receives an inputvideo signal Data transmitted from an external system (not illustrated),performs predetermined image processing on the input video signal Data,outputs the first image data DAT1 to the first timing controller 410,and outputs the second image data DAT2 to the second timing controller420. The first image data DAT1 is image data for displaying the colorimage, and the second image data DAT2 is image data for displaying themonochrome image.

The image processor 500 also outputs the first control signal CS1 to thefirst timing controller 410 and outputs the second control signal CS2 tothe second timing controller 420. The first control signal CS1 and thesecond control signal CS2 includes synchronizing signal to synchronizethe color image displayed on the first display panel 100 and themonochrome image displayed on the second display panel 200.

In the display device 1 according to this exemplary embodiment, theimage is displayed while two display panels of the first display panel100 and the second display panel 200 overlap each other, so that blackcan be faithfully reproduced. Therefore, the image having high contrastratio can be displayed. For example, the display device 1 is a highdynamic range (HDR) compatible television, and a local dimmingcompatible direct under type LED backlight may be used as backlight BL.In this case, the color image having high contrast ratio and higherimage quality can be displayed.

FIG. 4 is an exploded perspective view of the liquid crystal displaydevice 1 according to the present exemplary embodiment. FIG. 5 is apartially sectional view taken along line V-V in FIG. 4. FIG. 6 is apartially sectional view taken along line VI-VI in FIG. 4.

As illustrated in FIGS. 4-6, the display device 1 includes a frame 600retaining the first display panel 100, the second display panel 200 andthe backlight 300. The frame 600 consists of the upper frame 610, themiddle frame 620 and the lower frame 630.

In the display device 1, the upper frame 610, the first display panel100, the second display panel 200, the middle frame 620 and the lowerframe 630 are separately disposed in this order from the observer side.Note that the first display panel 100 and the backlight 300 is not shownin FIG. 4 in order to make understood easily.

As illustrated in FIGS. 5-6, the first display panel 100 is a liquidcrystal cell which includes a first thin-film-transistor substrate 101(hereinafter, referred to as a TFT substrate), a first opposed substrate102 being opposite to the first TFT substrate 101, and a first liquidcrystal layer 103 disposed between the first TFT substrate 101 and thefirst opposed substrate 102. The first opposed substrate 102 is closerto observer side than the first TFT substrate 101 is.

The first TFT substrate 101 is a substrate in which a TFT layer isformed on a transparent substrate such as a glass substrate. The TFTlayer includes a driving circuit, and is provided with TFTs and linesfor driving the TFTs. Pixel electrodes for applying a voltage to thefirst liquid crystal layer 103 are formed on a flattening layer of theTFT layer.

The first opposed substrate 102 is a CF substrate in which color filtersas pixel forming layer are formed on a transparent substrate such as aglass substrate. The pixel forming layer of the first opposed substrate102 includes a black matrix and color filters. The black matrix isformed into a lattice shape or a stripe shape. A plurality of openingscorresponding to pixels are formed in the black matrix. The colorfilters are provided in corresponding one of the openings of the blackmatrix. The color filters include a red color filter, a green colorfilter and a blue color filter. Each colored color filter corresponds topixels.

The first liquid crystal layer 103 is sealed between the first TFTsubstrate 101 and the first opposed substrate 102. A liquid crystalmolecule of the first liquid crystal layer 103 is selected in accordancewith a drive method.

The second display panel 200 is a liquid crystal cell which includes asecond TFT substrate 201, a second opposed substrate 202 being oppositeto the second TFT substrate 201, and a second liquid crystal layer 203disposed between the second TFT substrate 201 and the second opposedsubstrate 202. The second TFT substrate 201 is closer to observer side(the first display panel 100) than the second opposed substrate 202 is.

As illustrated in FIGS. 5-6, the second display panel 200 is disposedsuch that TFT substrate and opposed substrate are inverted compared tothe first display panel 100. Specifically, the first TFT substrate 101of the first display panel 100 and the second TFT substrate 201 of thesecond display panel 200 are opposed to each other.

The second TFT substrate 201 is a substrate in which a TFT layer isformed on a transparent substrate such as a glass substrate. The TFTlayer includes a driving circuit, and is provided with TFTs and linesfor driving the TFTs. Pixel electrodes for applying a voltage to thesecond liquid crystal layer 203 are formed on a flattening layer of theTFT layer.

The second opposed substrate 202 is a substrate in which pixel forminglayer are formed on a transparent substrate such as a glass substrate.The pixel forming layer of the second opposed substrate 202 includes ablack matrix. The black matrix is formed into a lattice shape or astripe shape. In this exemplary embodiment, the pixel forming layer ofthe second opposed substrate 202 does not include any color filter sincethe second display panel 200 displays a monochrome image.

The second liquid crystal layer 203 is sealed between the second TFTsubstrate 201 and the second opposed substrate 202. A liquid crystalmolecule of the second liquid crystal layer 203 is selected inaccordance with a drive method.

A pair of the first polarizers 104 is attached to both sides of thefirst display panel 100 respectively. The pair of the first polarizers104 is disposed such that a crossed Nicol positional relationship holds.That is, absorption axes (polarization axes) of the pair of the firstpolarizers 104 are substantially orthogonal to each other.

A pair of the second polarizers 204 is attached to both sides of thesecond display panel 200 respectively. The pair of the second polarizers204 is disposed such that a crossed Nicol positional relationship holds.That is, absorption axes (polarization axes) of the pair of the secondpolarizers 204 are substantially orthogonal to each other. Also, phasedifference films (retardation films) may be attached to the firstpolarizer 104 and the second polarizer 204 as needed.

The first display panel 100 and the second display panel 200 adhere toeach other by the adhesive layer 105. Specifically, a first polarizer104 disposed closer to the backlight 300 and a second polarizer 204disposed closer to observers adhere by the adhesive layer 105. Forexample, a transparent adhesive material such as an optically clearadhesive (OCA) is used as the adhesive layer 105. Note that diffusionsheet may be disposed between the first display panel 100 and the seconddisplay panel 200.

The backlight 300 includes a plurality of LEDs 310, a transparentsubstrate 320, an optical sheet 330 and the reflective plate 340.

For example, the LEDs 310 are light emitting diodes (LED). For example,white LED emitting white light can be used as the LED 310.

In this exemplary embodiment, backlight BL is of a direct under type.Specifically, the plurality of LEDs 310 are arrayed on a bottom part ofa lower frame 630. In this illustrated examples, the plurality of LEDs310 are arrayed on a bottom surface of a reflective plate 340 disposedin a recess of a lower frame 630.

The transparent substrate 320 is for example a rigid plate having alight transmitting characteristic.

The transparent substrate 320 is opposed to a body 631 of the lowerframe 630. Specifically, the transparent substrate 320 faces a bottomplate 631 a of the body 631. A peripheral edge of the transparentsubstrate 320 is placed between a lower flange 632 of the lower frame630 and a middle flange 621 of the middle frame 620. In this exemplaryembodiment, the peripheral edge of the transparent substrate 320 issupported by the lower flange 632 of the lower frame 630. Specifically,the peripheral edge of the transparent substrate 320 is placed on aflange of the reflective plate 340 placed on the lower flange 632.

Note that the transparent substrate 320 may have a light diffusingcharacteristic. In this case, light entering the transparent substrate320 pass the transparent substrate 320 while being diffused.

The optical sheet 330 is disposed in front of the plurality of the LEDs310. That is, the optical sheet 330 is disposed in a light exiting sideof the plurality of the LEDs 310. The optical sheet 330 is laminated ona front surface of the transparent substrate 320. The number of theoptical sheet 330 may be one or more. For example, a diffusing sheetand/or a prism sheet which are diffusing lights from the LEDs 310 can beused as the optical sheet 330.

The reflective plate 340 reflects light from the plurality of the LEDs310. The reflective plate 340 is disposed on the body 631 of the lowerframe 630. The reflective plate 340 consists of for example a metalplate such as a steel plate or an aluminum plate. In this case, a whitepaint may be applied on a surface of the reflective plate 340.

The upper frame 610, the middle frame 620 and the lower frame 630 arefixed to each other by for example screws.

The upper frame 610 is a front frame that is the closest to the observerside among components of the frame 600. The upper frame 610 is forexample a metallic frame formed into a rectangular framed shape in aplaner view and formed into an L-shape in a sectional view. The metallicframe is made of a metallic material having high rigidity such as asteel plate or an aluminum plate. The upper frame 610 includes aperipheral part 611 and a sidewall part 612.

The peripheral part 611 is a bezel or flange which covers a displaysurface of the first display panel 100. Specifically, the peripheralpart 611 is formed into framed shape so that the peripheral part 611covers all of a peripheral edge of the first display panel 100. In thisexemplary embodiment, the peripheral part 611 protrudes from an upperend of the sidewall part 612 in a direction parallel with the displaysurface of the first display panel 100. The peripheral part 611 isprovided with a protrusion portion 611 a protruding towards inner sidein a direction orthogonal to the display surface of the first displaypanel 100. For example the protrusion portion 611 a is formed by adrawing press processing.

An inner surface of an end portion of the peripheral part 611 isprovided with a cushion member 613. The cushion member 613 is disposedbetween the peripheral part 611 and the first display panel 100.Specifically, the cushion member 613 is inserted so as to be sandwichedbetween the peripheral part 611 and the first polarizer 104. Owing tothis, a space between the upper frame 610 and the first display panel100 (the first polarizer 104) could be small, dust and insects could beprevented from entering inside the display device 1.

The sidewall part 612 protrudes downward from the peripheral part 611.The sidewall part 612 is positioned in sides of the first display panel100, the second display panel 200 and the backlight 300. The sidewallpart 612 faces the sidewall 622 of the middle frame 620.

The middle frame 620 is an intermediate frame disposed between the upperframe 610 and the lower frame 630. The middle frame 620 supports thefirst display panel 100 and the second display panel 200 from abacklight side. In this exemplary embodiment, the middle frame 620 isfor example a metallic frame formed into a rectangular framed shape in aplaner view and formed into an L-shape in a sectional view. The metallicframe is made of a metallic material having high rigidity such as asteel plate or an aluminum plate. The middle frame 620 includes a middleflange 621 and a sidewall 622.

The first display panel 100 and the second display panel 200 aresandwiched between the middle flange 621 and the peripheral part 611 ofthe upper frame 610. Specifically, the peripheral edges of the firstdisplay panel 100 and the second display panel 200 are positionedbetween the middle flange 621 and the peripheral part 611. The middleflange 621 is formed into a framed shape so that the middle flange 621covers all of a rear surface of the peripheral edge of the seconddisplay panel 200.

An outer (upper) surface of an end portion of the middle flange 621 isprovided with a cushion member 623. The cushion member 623 is disposedbetween the middle flange 621 and the second display panel 200.Specifically, the cushion member 623 is inserted so as to be sandwichedbetween the middle flange 621 and the second polarizer 204.

An inner (lower) surface of an end portion of the middle flange 621 isprovided with a cushion member 624. The cushion member 624 is disposedbetween the middle flange 621 and the optical sheet 330.

The sidewall 622 protrudes downward from the middle flange 621. Thesidewall 622 is positioned in sides of the backlight 300. The sidewall622 is positioned between the sidewall part 612 of the upper frame 610and the sidewall part 631 b of the lower frame 630. The sidewall 622faces the sidewall part 612 of the upper frame 610 and the sidewall part631 b of the lower frame 630.

The lower frame 630 is a rear frame disposed closer to a rear side(−direction of Z-axis) among components of the frame 600. The lowerframe 630 accommodates the LEDs 310 of the backlight 300 and holds thetransparent substrate 320, the optical sheet 330 and the reflectiveplate 340. In this exemplary embodiment, the lower frame 630 is forexample a metallic housing generally shaped as a recess shape. Themetallic housing is made of a metallic material having high rigiditysuch as a steel plate or an aluminum plate. The lower frame 630 includesa body 631 and a lower flange 632.

The body 631 constitutes an accommodate space that accommodates aplurality of the LEDs 310. The body 631 includes a bottom (rear) plate631 a having a rectangular shape in a planner view, and a framedsidewall 631 b protruding upward from a peripheral ends of the bottomplate 631 a.

The lower flange 632 peripherally surrounds the body 631. In thisexemplary embodiment, the lower flange 632 protrudes from an upper endof the sidewall 631 b of the body 631 in a direction parallel with thedisplay surface of the first display panel 100. Note that a cushion maybe disposed between the lower flange 632 and a peripheral end of thetransparent substrate 320.

As illustrated in FIG. 4, a plurality of upper spacers 710 are disposedbetween the upper frame 610 and the middle frame 620. The upper spacers710 are sandwiched between the upper frame 610 and the middle frame 620,and retain a distance between the upper frame 610 and the middle frame620. The upper spacers 710 also restrict the first display panel 100 andthe second display panel 200 in an in-plane direction.

A plurality of lower spacers 720 are disposed between the middle frame620 and the lower frame 630. The lower spacers 720 are sandwichedbetween the middle frame 620 and the lower frame 630, and retain adistance between the middle frame 620 and the lower frame 630. The lowerspacers 720 also restrict the transparent substrate 320 in an in-planedirection.

For example, the upper spacers 710 and the lower spacers 720 are, butnot limited to, resin moldings. For example, the upper spacers 710 andthe lower spacers 720 may be made of metallic materials.

As illustrated in FIG. 5 which shows sectional view along with alongitudinal direction of the display device 1, the first source FPC 110and the second source FPC 210 are disposed between the upper frame 610and the middle frame 620. The first source FPC 110 is connected to ainner side of the first TFT substrate 101 of the first display panel100, and the second source FPC 210 is connected to a inner side of thesecond TFT substrate 201 of the second display panel 200. The inner sideof the first TFT substrate 101 faces the first opposed substrate 102,and the inner side of the second TFT substrate 201 faces the secondopposed substrate 202.

The first source FPC 110 is apart from the second source FPC 210 whileat least part of the first source FPC 110 overlaps the second source FPC210 in plan view. In this exemplary embodiment, almost all of the firstsource FPC 110 overlaps almost all of the second source FPC 210 in planview.

The first source driver 111 outputting a drive signal to the firstdisplay panel 100 is mounted on the first source FPC 110. The secondsource driver 211 outputting a drive signal to the second display panel200 is mounted on the second source FPC 210.

In this exemplary embodiment, the first source FPC 110 is connected tothe first display panel 100 so that the first source driver 111 is on asurface of the first source FPC 110, which faces the second source FPC210. The second source FPC 210 is connected to the second display panel200 so that the second source driver 211 is on a surface of the secondsource FPC 210, which faces the first source FPC 110. That is to say,the first source driver 111 and the second source driver 211 are placedat an inner side, between the first source FPC 110 and the second sourceFPC 210.

With this layout, a conductive pattern of the first source FPC 110 iscloser to the second source FPC 210 than a base substrate of the firstsource FPC 110 is, while a conductive pattern of the second source FPC210 is closer to the first source FPC 110 than a base substrate of thesecond source FPC 210 is. That is to say, the conductive patterns of thefirst source FPC 110 and the conductive patterns of the second sourceFPC 210 are placed at the inner side, between the first source FPC 110and the second source FPC 210. In other words, the conductive pattern ofthe first source FPC 110 is on a surface of the first source FPC 110,which faces the second source FPC 210 while the conductive pattern ofthe second source FPC 210 is on a surface of the second source FPC 210,which faces the first source FPC 110.

Each of the first source FPC 110 and the second source FPC 210 is curvedalong with the upper frame 610 and the middle frame 620. Both have aL-shape in a cross sectional view. Specifically, the first source FPC110 and the second source FPC 210 are bent while being placed betweenthe peripheral part 611 of the upper frame 610 and the middle flange 621of the middle frame 620, as well as between the sidewall part 612 of theupper frame 610 and the sidewall part 622 of the middle frame 620.

In this case, the first source FPC 110 and the second source FPC 210 arebent so that the second source FPC 210 is placed on an inner sidecompared to the first source FPC 110.

The first source FPC 110 is in contact with the protrusion portion 611 aof the peripheral part 611 of the upper frame 610. Specifically, asurface of the first source FPC 110, which is on an opposite side of asurface on which the first source driver 111 is mounted, is in contactwith the protrusion portion 611 a. Due to this, heat generated from thefirst source driver 111 can efficiently dissipate in the upper frame 610via the protrusion portion 611 a.

The second source FPC 210 is in contact with the heat conductive sheet625 disposed on the middle flange 621 of the middle frame 620.Specifically, a surface of the second source FPC 210, which is on anopposite side of a surface on which the second source driver 211 ismounted, is in contact with the heat conductive sheet 625. Due to this,heat generated from the second source driver 211 can efficientlydissipate in the middle frame 620 via the heat conductive sheet 625.

The display device 1 further includes a compressible electricallyinsulating material 810. In this exemplary embodiment, the elasticinsulating material 810 is made of an elastic insulating sheet. Theinsulating sheet 810 is disposed around a long edge of the displaydevice 1. The insulating sheet 810 is disposed between the first sourceFPC 110 and the second source FPC 210 which are disposed around the longedge of the display device 1. The insulating sheet 810 is placed atleast between the first source driver 111 and the second source driver211. In this exemplary embodiment, the insulating sheet 810 covers thesecond source driver 211.

The insulating sheet 810 functions as a sheet cushion member havinginsulating properties. Therefore, when the insulating sheet 810 comesinto contact with the first source driver 111 and/or the second sourcedriver 211, or comes into contact with the first source FPC 110 and/orthe second source FPC 210, the insulating sheet 810 could prevent thefirst source driver 111 and the second source driver 211 from beingdamaged, or prevent the first source FPC 110 and the second source FPC210 from being damaged.

For example, the insulating sheet 810 is made from insulating resinmaterials having a closed-cell structure such as urethane, polyethylenefoam and sponge, or elastomers such as silicon rubber. But theinsulating sheet 810 is not limited to these materials. The insulatingsheet 810 can be made from various materials having insulatingproperties and cushion properties.

Thus, the display device 1 according to this exemplary embodimentincludes the elastic insulating sheet 810 disposed between the firstsource driver 111 on the first source FPC (first flexible substrate) 110and the second source driver 211 on the second source FPC (secondflexible substrate) 210.

With this structure, even if the first source FPC 110 and the secondsource FPC 210 overlap each other, the first source driver 111 can beprevented from being in contact with the second source FPC 210 becausethe first source driver 111 is isolated from the second source FPC 210by the insulating sheet 810. Therefore, the second source FPC 210 can beprevented from being disconnected due to a contact between the firstsource driver 111 and the second source FPC 210.

Also, the second source driver 211 can be prevented from being incontact with the first source FPC 110 because the second source driver211 is isolated from the first source FPC 110 by the insulating sheet810. Therefore, the first source FPC 110 can be prevented from beingdisconnected due to a contact between the second source driver 211 andthe first source FPC 110.

In this exemplary embodiment, the insulating sheet 810 does not haveadhesiveness. Therefore, the insulating sheet 810 has a smooth surface.Thus, the insulating sheet 810 will not adhere to the first source FPC110, the first source driver 111, the second source FPC 210 and thesecond source driver 211.

That is to say, the insulating sheet 810 is not attached to the firstsource FPC 110 nor the second source FPC 210. Thus, conductive patterns(lines) of the first source FPC 110 and the second source FPC 210 willnot be disconnected. The following explains this point in detail.

If the insulating sheet 810 is attached to the first source FPC 110 orthe second source FPC 210, when an ambient temperature around the firstsource FPC 110 and the second source FPC 210 changes due to operation ofthe display device 1, a difference in thermal expansion or contractionbetween the insulating sheet 810 and the first source FPC 110 or thesecond source FPC 210 occurs because of a difference in a linearexpansion coefficient between the insulating sheet 810 and the firstsource FPC 110 or the second source FPC 210. Then, a stress according tothe difference of the linear expansion coefficient occurs in the firstsource FPC 110 or the second source FPC 210. This can cause conductivepatterns of the first source FPC 110 and the second source FPC 210 to bedisconnected. In this regard, according to this exemplary embodiment,because the insulating sheet 810 is not attached to the first source FPC110 or the second source FPC 210, conductive patterns of the firstsource FPC 110 and the second source FPC 210 can be prevented from beingdisconnected due to a stress caused by the differences of linearexpansion coefficients.

In this exemplary embodiment, the insulating sheet 810 is attached tothe second circuit board 212 that is connected to the second source FPC210. Specifically, the insulating sheet 810 is attached to the secondcircuit board 212 in a cantilever state. That is to say, one end of theinsulating sheet 810 is a fixed end connected to the second source FPC210, while the other end of the insulating sheet 810 is free end and notconnected anywhere. The insulating sheet 810 and the second circuitboard 212 are attached to each other through an adhesion material. Partsof the insulating sheet 810 except the part adhered to the secondcircuit board 212 are not fixed and are free for flexible movement.

Thus, in this exemplary embodiment, the insulating sheet 810 is attachedto the second circuit board 212 in a cantilever state.

With this structure, while the insulating sheet 810 covers the firstsource driver 111 and the second source driver 211, the insulating sheet810 can easily be mounted without being attached to the first source FPC110 and the second source FPC 210. That is to say, the insulating sheet810 can be unconstrained by the first source FPC 110 and the secondsource FPC 210.

In addition, the insulating sheet 810 does not overlap with the firstdisplay panel 100 and the second display panel 200. Although theinsulating sheet 810 extends from the second circuit board 212 towardsthe first display panel 100 and the second display panel 200, andextends beyond the first source driver 111 and the second source driver211, the other end (free end) of the insulating sheet 810 does not reachthe first display panel 100 and the second display panel 200.

That is to say, since the first source FPC 110 and the second source FPC210 are attached to the first display panel 100 and the second displaypanel 200 respectively, if the other end of the insulating sheet 810reached the first display panel 100 or the second display panel 200, itis possible that the first source FPC 110 would peel off from the firstdisplay panel 100 or the second source FPC 210 peel off from the seconddisplay panel 200 because a stress is concentrated on an adhesive areabetween the first display panel 100 and the first source FPC 110 or anadhesive area between the second display panel 200 and the second sourceFPC 210 due to a movement of the insulating sheet 810. Contrary to this,when the insulating sheet 810 does not overlap with the first displaypanel 100 and the second display panel 200, the first source FPC 110 canbe prevented from peeling off from the first display panel 100 and thesecond source FPC 210 can be prevented from peeling off from the seconddisplay panel 200 because stresses on an adhesive area between the firstdisplay panel 100 and the first source FPC 110 or an adhesive areabetween the second display panel 200 and the second source FPC 210 canbe reduced even if the insulating sheet 810 moves.

In this exemplary embodiment, as illustrated in FIG. 5, the first sourceFPC 110 and the second source FPC 210 are bent so that the second sourceFPC 210 is placed on an inner side compared to the first source FPC 110.A conductive pattern of the second source FPC 210 is closer to the firstsource FPC 110 than a base substrate of the second source FPC 210 is.

When such a first source FPC 110 and a second source FPC 210 are bent,and a stress occurs in a conductive pattern of the second source FPC210, then the conductive pattern of the second source FPC 210 is moreeasily disconnected.

In this case, the insulating sheet 810 is attached to the first sourceFPC 110 or the second source FPC 210, and the conductive pattern of thesecond source FPC 210 is more easily disconnected because of adifference in thermal expansion or contraction between the insulatingsheet 810 and the first source FPC 110 or the second source FPC 210. Inthis regard, according to this exemplary embodiment, because theinsulating sheet 810 is not attached to the first source FPC 110 or thesecond source FPC 210, the conductive pattern of the second source FPC210 can be prevented from being disconnected because the difference inthermal expansion or contraction between the insulating sheet 810 andthe first source FPC 110 or the second source FPC 210 does not matter.

In this exemplary embodiment, the first TFT substrate 101 of the firstdisplay panel 100 faces the second TFT substrate 201 of the seconddisplay panel 200, and the first source FPC 110 is connected to an innerside of the first TFT substrate 101 of the first display panel 100, andthe second source FPC 210 is connected to an inner side of the secondTFT substrate 201 of the second display panel 200.

With this, the first source FPC 110 and the second source FPC 210 can beeasily attached to the first display panel 100 and the second displaypanel 200, respectively, in a state where the first source driver 111and the second source driver 211 face each other.

Next, the first gate FPC 120 and the second gate FPC 220 which areplaced along with a short edge of the display device 1 will be explainedthereafter.

As illustrated in FIG. 6 which shows sectional view along with a lateraldirection of the display device 1, the first gate FPC 120 and the secondgate FPC 220 are disposed between the upper frame 610 and the middleframe 620. The first gate FPC 120 is connected to the inner side of thefirst TFT substrate 101 of the first display panel 100, and the secondgate FPC 220 is connected to the inner side of the second TFT substrate201 of the second display panel 200.

The first gate FPC 120 is apart from the second gate FPC 220 while atleast part of the first gate FPC 120 overlaps the second gate FPC 220 inplan view. In this exemplary embodiment, almost all of the first gateFPC 120 overlaps almost all of the second gate FPC 220 in plan view.

The first gate driver 121 outputting a drive signal to the first displaypanel 100 is mounted on the first gate FPC 120. The second gate driver221 outputting a drive signal to the second display panel 200 is mountedon the second gate FPC 220.

In this exemplary embodiment, the first gate FPC 120 is connected to thefirst display panel 100 so that the first gate driver 121 is on a sideof the second gate FPC 220. The second gate FPC 220 is connected to thesecond display panel 200 so that the second gate driver 221 is on a sideof the first gate FPC 120. That is to say, the first gate driver 121 andthe second gate driver 221 are placed in inner side, between the firstgate FPC 120 and the second gate FPC 220.

With this layout, a conductive pattern of the first gate FPC 120 iscloser to the second gate FPC 220 than a base substrate of the firstgate FPC 120 is, while a conductive pattern of the second gate FPC 220is closer to the first gate FPC 120 than a base substrate of the secondgate FPC 220 is. That is to say, each of the conductive patterns of thefirst gate FPC 120 and the second gate FPC 220 is placed in inner side,between the first gate FPC 120 and the second gate FPC 220.

Similar to the first source FPC 110, the first gate FPC 120 is incontact with the protrusion portion 611 a of the peripheral part 611 ofthe upper frame 610. Specifically, a surface of the first gate FPC 120,which is on an opposite side of a surface on which the first gate driver121 is mounted, is in contact with the protrusion portion 611 a. Withthis, heat generated from the first gate driver 121 can efficientlydissipate in the upper frame 610 via the protrusion portion 611 a.

Similar to the second source FPC 210, the second gate FPC 220 is incontact with the heat conductive sheet 625 disposed on the middle flange621 of the middle frame 620. Specifically, a surface of the second gateFPC 220, which is on an opposite side of a surface on which the secondgate driver 221 is mounted, is in contact with the heat conductive sheet625. With this, heat generated from the second gate driver 221 canefficiently dissipate in the middle frame 620 via the heat conductivesheet 625.

The display device 1 further includes an compressible electricallyinsulating sheet 820 disposed around the short edge of the displaydevice 1. The insulating sheet 820 is a second insulating sheet disposedaround the short edge of the display device 1. The insulating sheet 820is disposed between the first gate FPC 120 and the second gate FPC 220which are disposed around the short edge of the display device 1. Theinsulating sheet 820 is placed at least between the first gate driver121 and the second gate driver 221. In this exemplary embodiment, theinsulating sheet 820 covers the second source driver 211.

The insulating sheet 820 may be made from a same material of theinsulating sheet 810. The insulating sheet 820 functions as a sheetcushion member having insulating properties. Therefore, in case theinsulating sheet 820 is in contact with the first gate driver 121 and/orthe second gate driver 221, or is in contact with the first gate FPC 120and/or the second gate FPC 220, the insulating sheet 820 could preventthe first gate driver 121 and the second gate driver 221 from beingdamaged, or prevent the first gate FPC 120 and the second gate FPC 220from being damaged.

Thus, the display device 1 according to this exemplary embodimentincludes the elastic insulating sheet 820 disposed between the firstgate driver 121 on the first gate FPC (first flexible substrate) 120 andthe second gate driver 221 on the second gate FPC (second flexiblesubstrate) 220.

With structure, even if the first gate FPC 120 and the second gate FPC220 overlap to each other, the first gate driver 121 can be preventedfrom being in contact with the second gate FPC 220 because the firstgate driver 121 is isolated from the second gate FPC 220 by theinsulating sheet 820. Therefore, the second gate FPC 220 can beprevented from being disconnected due to a contact between the firstgate driver 121 and the second gate FPC 220.

Also, the second gate driver 221 can be prevented from being in contactwith the first gate FPC 120 because the second gate driver 221 isisolated from the first gate FPC 120 by the insulating sheet 820.Therefore, the first gate FPC 120 can be prevented from beingdisconnected due to a contact between the second gate driver 221 and thefirst gate FPC 120.

In this exemplary embodiment, the insulating sheet 820 does not haveadhesiveness. Therefore, the insulating sheet 820 has a smooth surface.Thus, the insulating sheet 820 will not be adhere to the first gate FPC120, the first gate driver 121, the second gate FPC 220 and the secondgate driver 221.

That is to say, the insulating sheet 820 is not attached to the firstgate FPC 120 nor the second gate FPC 220. Thus, conductive patterns(lines) of the first gate FPC 120 and the second gate FPC 220 will notbe disconnected as explained above with reference to the insulatingsheet 810, the first source FPC 110 and the second source FPC 210.

In this exemplary embodiment, the insulating sheet 820 is attached tothe second display panel 200. Specifically, the insulating sheet 820 isattached to the second TFT substrate 201 of the second display panel 200in a cantilever state. That is to say, one end of the insulating sheet820 is a fixed end connected to the second TFT substrate 201, while theother end of the insulating sheet 820 is a free end not connectedanywhere. For example, the insulating sheet 820 and the second TFTsubstrate 201 are attached to each other through an adhesion material.

First Modification

A display device 1A according to a first modification will be describedbelow with reference to FIG. 7. FIG. 7 corresponds to FIG. 5 and is apartially sectional view along with a long edge of the display device1A.

Although the insulating sheet 810 is attached to the second circuitboard 212 in the above exemplary embodiment as shown in FIG. 5, theinsulating sheet 810 according to this modification, as shown in FIG. 7,is attached to the second display panel 200 like the insulating sheet820 disposed in the short edge of the display device 1.

The insulating sheet 810 is attached to the second TFT substrate 201 ofthe second display panel 200 in a cantilever state. That is to say, oneend of the insulating sheet 810 is a fixed end connected to the secondTFT substrate 201, while the other end of the insulating sheet 810 is afree end not connected anywhere. For example, the insulating sheet 810and the second TFT substrate 201 are attached to each other through anadhesion material.

Note that in the the display device 1A according to this modification,other structure except arrangement of the insulating sheet 810 is sameas the display device 1 of the first exemplary embodiment.

The elastic insulating sheet 810 is disposed between the first sourceFPC 110 and the second source FPC 210. The insulating sheet 810 isplaced at least between the first source driver 111 and the secondsource FPC 210, specifically, the insulating sheet 810 is placed betweenthe first source driver 111 and the second source driver 211. Theinsulating sheet 810 covers the second source driver 211.

Owing to this structure, even if the first source FPC 110 and the secondsource FPC 210 overlap to each other, the first source driver 111 can beprevented from being in contact with the second source FPC 210 becausethe first source driver 111 is isolated from the second source FPC 210by the insulating sheet 810. Therefore, the second source FPC 210 can beprevented from being disconnected due to a contact between the firstsource driver 111 and the second source FPC 210.

Also, the second source driver 211 can be prevented from being incontact with the first source FPC 110 because the second source driver211 is isolated from the first source FPC 110 by the insulating sheet810. Therefore, the first source FPC 110 can be prevented from beingdisconnected due to a contact between the second source driver 211 andthe first source FPC 110.

Second Modification

Next, the display device 1B according to a second modification will beexplained. FIG. 8 is a partially sectional view of the liquid crystaldisplay device according to the second modification. FIG. 8 correspondsto FIG. 5 and show a sectional view along with a longitudinal edge ofthe display device 1B.

As shown in FIG. 5, in the the display device 1 disclosed above, thesecond display panel 200 is disposed such that the first TFT substrateand the first opposed substrate are inverted compared to the firstdisplay panel 100.

Contrary to this, as shown in FIG. 8, in the display device 1B, each ofthe first display panel 100 and the second display panel 200 has anopposed substrate disposed closer to an observer side and a TFTsubstrate disposed closer to the backlight side.

Also in this modification, the elastic insulating sheet 810 is disposedbetween the first source FPC 110 and the second source FPC 210. Theinsulating sheet 810 is placed at least between the first source driver111 and the second source FPC 210, specifically, the insulating sheet810 is placed between the first source driver 111 and the second sourcedriver 211. The insulating sheet 810 covers the second source driver211.

With this structure, even if the first source FPC 110 and the secondsource FPC 210 overlap to each other, the first source driver 111 can beprevented from being in contact with the second source FPC 210 becausethe first source driver 111 is isolated from the second source FPC 210by the insulating sheet 810. Therefore, the second source FPC 210 can beprevented from being disconnected due to a contact between the firstsource driver 111 and the second source FPC 210.

Also, the second source driver 211 can be prevented from being incontact with the first source FPC 110 because the second source driver211 is isolated from the first source FPC 110 by the insulating sheet810. Therefore, the first source FPC 110 can be prevented from beingdisconnected due to a contact between the second source driver 211 andthe first source FPC 110.

Third Modification

A display device 1C according to a third modification will be describedbelow with reference to FIG. 9. FIG. 9 corresponds to FIG. 6 and is apartially sectional view along with a short edge of the display device1C.

As shown in FIG. 6, the display device 1 according to above exemplaryembodiment, the insulating sheet 820 is attached to the second displaypanel 200.

Contrary to above, the display device 1C according to this modification,as shown in FIG. 9, the insulating sheet 820 is attached to a spacer 730fixed to the middle flange 621 of the middle frame 620. Owing to theprovision of the spacer 730, it is possible to adjust a position of theinsulating sheet 820. For example, the spacer 730 is made from resinmaterials such as PET or metal materials such as Aluminum.

In the display device 1C according to this modification, the elasticinsulating sheet 820 is disposed between the first gate FPC 120 and thesecond gate FPC 220. The insulating sheet 820 is placed at least betweenthe first gate driver 121 and the second gate FPC 220, specifically, theinsulating sheet 820 is placed between the first gate driver 121 and thesecond gate driver 221. The insulating sheet 820 covers the second gatedriver 221.

Owing to this structure, even if the first gate FPC 120 and the secondgate FPC 220 overlap to each other, the first gate driver 121 can beprevented from being in contact with the second gate FPC 220 because thefirst gate driver 121 is isolated from the second gate FPC 220 by theinsulating sheet 820. Therefore, the second gate FPC 220 can beprevented from being disconnected due to a contact between the firstgate driver 121 and the second gate FPC 220.

Also, the second gate driver 221 can be prevented from being in contactwith the first gate FPC 120 because the second gate driver 221 isisolated from the first gate FPC 120 by the insulating sheet 820.Therefore, the first gate FPC 120 can be prevented from beingdisconnected due to a contact between the second gate driver 221 and thefirst gate FPC 120.

Note that the spacer 730 may be integral with the upper spacer 710. Thatis to say, the insulating sheet 820 is arranged by means of the upperspacer 710.

Also, as shown in FIG. 10, the middle flange 621 of the middle frame 620may be provided with a protrusion portion 621 a instead of providing thespacer 730. For example the protrusion portion 621 a is formed by adrawing press processing.

Other Modification

In the above exemplary embodiment and modifications, the first sourcedriver 111 and the second source driver 211 overlap to each other, whilethe first gate driver 121 and the second gate driver 221 overlap to eachother. However, the first source driver 111 and the second source driver211 may not overlap to each other, and the first gate driver 121 and thesecond gate driver 221 may not overlap to each other. Owing to thisstructure, the first source driver 111 and the second source driver 211can be prevented from being in contact with each other, as well as thefirst gate driver 121 and the second gate driver 221 can be preventedfrom being in contact with each other.

In the above exemplary embodiment, although the first display panel 100and the second display panel 200 are liquid crystal displays, they arenot limited to liquid crystal displays.

In the above exemplary embodiment, a quantum dot technology can apply tothe backlight 300.

Those skilled in the art will readily appreciate that many modificationsare possible in the above exemplary embodiment and variations withoutmaterially departing from the novel teachings and advantages of thepresent disclosure. Accordingly, all such modifications are intended tobe included within the scope of the present disclosure.

What is claimed is:
 1. A display device comprising: a first displaypanel; a first flexible substrate on which a first driver IC outputtinga driving signal to the first display panel is mounted; a secondflexible substrate being apart from the first flexible substrate, atleast a part of the second flexible substrate overlapping the firstflexible substrate; and a compressible insulating material disposedbetween the first flexible substrate and the second flexible substrate,wherein the first flexible substrate is connected to the first displaypanel so that the first driver IC is on a side of the second flexiblesubstrate, and the insulating material is disposed between the firstdriver IC and the second flexible substrate.
 2. The display deviceaccording to claim 1, wherein a circuit board is connected to at leastone of the first flexible substrate and the second flexible substrate,and the insulating material is attached to the circuit board in acantilever state.
 3. The display device according to claim 2, whereinthe circuit board is connected to the second flexible substrate.
 4. Thedisplay device according to claim 1, wherein a second driver IC ismounted on the second flexible substrate, and the insulating materialcovers the second driver IC.
 5. The display device according to claim 4,wherein the first driver IC and the second driver IC are not overlappedto each other in a laminate direction of the first flexible substrateand the second flexible substrate.
 6. The display device according toclaim 1, wherein the insulating material does not overlap with the firstdisplay panel.
 7. The display device according to claim 1, wherein thefirst flexible substrate and the second flexible substrate are bent sothat the second flexible substrate is placed on an inner side of thefirst flexible substrate.
 8. The display device according to claim 7,wherein a conductive pattern of the second flexible substrate is on asurface of the second flexible substrate, the surface facing the firstflexible substrate.
 9. The display device according to claim 1, furthercomprising a second display panel connected to the second flexiblesubstrate.
 10. The display device according to claim 9, wherein each ofthe first display panel and the second display panel includes a TFTsubstrate having a drive circuit layer and an opposed substrate opposingto the TFT substrate, the TFT substrate of the first display panel facesthe TFT substrate of the second display panel, the first flexiblesubstrate is connected to an inner side of the TFT substrate of thefirst display panel, and the second flexible substrate is connected toan inner side of the TFT substrate of the second display panel.